CN2348362Y - Oil level precision measuring device for large oil-storage tank - Google Patents
Oil level precision measuring device for large oil-storage tank Download PDFInfo
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- CN2348362Y CN2348362Y CN 98206186 CN98206186U CN2348362Y CN 2348362 Y CN2348362 Y CN 2348362Y CN 98206186 CN98206186 CN 98206186 CN 98206186 U CN98206186 U CN 98206186U CN 2348362 Y CN2348362 Y CN 2348362Y
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Abstract
The utility model discloses an oil level precision measuring device for a large oil-storage tank, which mainly comprises a water level controller, an accumulated water detector, segment level detectors, a segment level tracking controller, a differential pressure sensor, etc. A pressure sensor with high precision and small measurement range is adopted to be matched with two segment level detectors and one segment level tracking controller, a differential pressure of water levels in the segment level detectors and an oil level is utilized to detect an oil level in some section of an oil tank to decrease a measurement absolute error by an order of magnitude, and thus, the measurement accuracy is enhanced. The utility model can be used for precision measurement of the oil level in the large oil-storage tank.
Description
The utility model belongs to liquid level automatic measurement and control device, specifically the accurate oil level measuring device of large-scale oil storage tank.
Now, general liquid petroleum product all is stored in the storage tank, because liquid petroleum product all contains moisture content, its moisture content deposits gradually in the storage tank bottom, and along with the increased frequency of changing oil, water is cumulative, judge what of ponding, can only drop into and scribble the height that the scale of meeting the water allochroic paint is judged ponding, utilize the ponding bleed valve to adopt manual emission again, need so can not know the oil level of storage tank to measure.Existing large-scale oil storage tank adopts steel tape to measure as the oil-level measurement of all kinds of large-scale oil storage tanks of petrochemical plant, refinery, storage tank farm, and the ball float method is measured and the pressure application measurement.Pressure application is to measure oil level indirectly by the pressure reduction of measuring oil level and air.As shown in Figure 3, during measurement, ponding bleed valve 13 communicates with the bottom of storage tank, and the anode of pressure transducer 7 links to each other with the storage tank bottom by pressure pipe 4, and negative terminal communicates with air, and digital display meter 8 links to each other with pressure transducer 7 by signal cable 2.Range must be consistent with the height of storage tank during because of measurement, and general large-scale oil storage tank very high (＞10 meters), so what this device adopted is the pressure transducer of wide range, and the absolute value of measuring error equals the range that the precision of sensor multiply by sensor, under the certain situation of precision, although adopt high-precision pressure transducer, but range is big more, absolute error is big more, has caused the absolute error of measurement very big, and can not accurately measure oil level.
The purpose of this utility model is to provide a kind of can accurately measure the storage tank oil level, and the high accurate oil level measuring device of large-scale oil storage tank of measuring accuracy.
The utility model is achieved in that the accurate oil level measuring device of a kind of large-scale oil storage tank, comprise the ponding discharge solenoid valve that links to each other with the bottom of storage tank, the pressure pipe, pressure transducer that links to each other with the pressure pipe and the digital display meter that links to each other with pressure transducer by signal cable that bottom storage tank, communicate, wherein, the anode of pressure transducer communicates with the bottom of storage tank by the pressure pipe, and negative terminal links to each other with the section detector by the pressure pipe; Water level controller links to each other with the ponding detector with the ponding discharge solenoid valve respectively by signal cable; The lower end of ponding detector links to each other with the bottom of storage tank and the lower end of section detector respectively by the pressure pipe, and the upper end communicates with the inside of storage tank; The section detector links to each other with digital display meter with the section tracking control unit respectively by signal cable; The section tracking control unit links to each other with section detector, entering water electromagnetic valve and the solenoid valve that discharges water respectively by signal cable; Has the communication interface that can be connected on the digital display meter with microcomputer; The lower end of section detector links to each other with the solenoid valve that discharges water with entering water electromagnetic valve respectively by the pressure pipe.
The utility model is the ponding layer that utilizes storage tank bottom, pressure application is surveyed oily device change the pressure differential method into and survey oily device.During measurement, the overall height of large oil tank is divided into some equal sections, adopt with the same precision of pressure application measurement mechanism but the little pressure transducer of range, its range is a five equilibrium height, its height is identical with the section that oil tank is divided, two section detectors of adapted, a section tracking control unit again utilize the pressure reduction of oil level and section detector middle water level, measure the oil level in certain section oil tank.When the oil level of oil tank rises to a certain height, its section is recorded by first section detector, send corresponding signal, the entering water electromagnetic valve that control links to each other with second section detector is opened, water-filling in second section detector, when water level rose to first section detector survey with the section height, second section detector sent corresponding signal, with closed electromagnetic valve.At this moment, second interior water level of section detector keeps this height, and fluid column pressure is added in the negative terminal of pressure transducer.Obviously, the pressure reduction that acts on pressure transducer is the pressure differential that oil level produces in the section.Oil level continues to rise, and more than action repeats at each section.The section sequence number is provided by first section detector.The section sequence number has represented that oil is at the oil level of the reference position of this section in the storage tank, the output of pressure transducer has represented that innage is in the oil level of this section reference position in the storage tank, and the oil level sum of oil level that the section sequence number is represented and pressure transducer output expression is exactly actual measured oil level.
When the oil level of oil tank descends, the section that it descended is recorded by first section detector, send corresponding signal, the solenoid valve that discharges water that control links to each other with second section detector is opened, outwards discharge water, when decline of water table to the decline section height of first section section that detector is surveyed the time, send corresponding signal, with closed electromagnetic valve.At this moment, second interior water level of section detector keeps this height, fluid column pressure adds the negative terminal that is pressed in pressure transducer, is individual process very slowly because the oil tank oil level descends, and pretends the pressure reduction that is used on the pressure transducer and remains the pressure differential that oil level produces in the section.Oil level continues to descend, and more than action repeats at each section.The section sequence number is provided by the section detector.The section sequence number has represented that oil is at the oil level of this section reference position in the storage tank, and the output of pressure transducer has represented that innage is in the oil level of this section reference position in the storage tank.The oil level sum of oil level that the section sequence number is represented and pressure transducer output expression still is exactly actual measured oil level.
Because first section detector is communicated with big oil tank; its fluctuation in stage speed is consistent with the oil level rising or falling speed; very slow; the volume of second section detector is then very little; its fluctuation in stage speed is very fast; so the speed of second section detector fluid column pressure generation is very fast, this has just guaranteed the adjacent segment interdigit, and the fluid column pressure difference is in the continuity of cutting commentaries on classics and the consistance of pressure transducer.
Advantage of the present utility model is: adopt the pressure transducer of high precision, little range, two section detectors of adapted, a section tracking control unit utilize the pressure reduction of oil level and section detector middle water level, measure the oil level in certain section oil tank.Make the measurement absolute error reduce an order of magnitude, improved the oil-level measurement precision.
The utlity model has three accompanying drawings:
Fig. 1 is a synoptic diagram of the present utility model.
Fig. 2 is the structural representation of the utility model section detector;
Fig. 3 is the synoptic diagram of prior-art devices.
Now in conjunction with the accompanying drawings and embodiments the utility model is further described:
As shown in Figure 1 and Figure 2, the utility model comprises: water level controller 1, signal cable 2, ponding detector 3, pressure pipe 4, section detector 5 and 10, section tracking control unit 6, pressure transducer 7, digital display meter 8, entering water electromagnetic valve 11, solenoid valve 12 and ponding discharge solenoid valve 13 discharge water.Water level controller 1 links to each other with ponding detector 3 with ponding discharge solenoid valve 13 respectively by signal cable 2; The lower end of ponding detector 3 links to each other with the bottom of storage tank and the lower end of section detector 5 respectively by pressure pipe 4, and the upper end communicates with the inside of storage tank; Section detector 5 is connected with digital display meter 8 with section tracking control unit 6 respectively by signal cable 2; Section tracking control unit 6 links to each other with section detector 10, entering water electromagnetic valve 11 and the solenoid valve 12 that discharges water respectively by signal cable 2; The anode of pressure transducer 7 communicates with the bottom of storage tank by pressure pipe 4, and negative terminal links to each other with section detector 10 by pressure pipe 4; Has the communication interface 9 that can be connected on the digital display meter 8 with microcomputer; The lower end of section detector 10 links to each other with the solenoid valve 12 that discharges water with entering water electromagnetic valve 11 respectively by pressure pipe 4.
This measurement mechanism was done actual measurement on certain large-scale oil storage tank, this storage tank is high 12 meters, 9 meters of diameters, in adorn 70
#Gasoline makes the oil level lifting in the scope of 1-5 rice, this device is made function and accuracy test, and the precision of used section detector 5 is 0.1 grade, and the precision of pressure transducer 7 is 0.1 grade, and the precision of digital display meter 8 is 0.1 grade.Be communicated with oil tank with vertical glass tube, show an oil level in the jar, use through the qualified millimeter scale Steel Ruler of measurement verification and make the reading standard, done twice lifting test, survey 2 points for every meter, every some interval 500mm with this device.After tested, the value that value that digital display meter shows and Steel Ruler show, its error≤2mm.Wherein sensor errors is: δ
Δ p=1000 * 0.001=1mm.If the prior art of using, then sensor errors is δ
p=12000 * 0.001=12mm.
Claims (3)
1. the accurate oil level measuring device of a large-scale oil storage tank, comprise the ponding discharge solenoid valve (13) that links to each other with the bottom of storage tank, the pressure pipe (4), pressure transducer (7) that links to each other with pressure pipe (4) and the digital display meter (8) that links to each other with pressure transducer (7) by signal cable (2) that bottom storage tank, communicate, it is characterized in that: the anode of pressure transducer (7) communicates with the bottom of storage tank by pressure pipe (4), and negative terminal links to each other with section detector (10) by pressure pipe (4); Water level controller (1) links to each other with ponding detector (3) with ponding discharge solenoid valve (13) respectively by signal cable (2); The lower end of ponding detector (3) links to each other with the bottom of storage tank and the lower end of section detector (5) respectively by pressure pipe (4), and the upper end communicates with the inside of storage tank; Section detector (5) links to each other with digital display meter (8) with section tracking control unit (6) respectively by signal cable (2); Section tracking control unit (6) links to each other with section detector (10), entering water electromagnetic valve (11) and the solenoid valve that discharges water (12) respectively by signal cable (2); Has the communication interface (9) that can be connected on the digital display meter (8) with microcomputer; The lower end of section detector (10) links to each other with the solenoid valve that discharges water (12) with entering water electromagnetic valve (11) respectively by pressure pipe (4).
2. according to the described measurement mechanism of claim 1, it is characterized in that: section detector (5) and (10) are formed by the electrode (15) that equidistantly vertically is arranged on the substrate (14) by being installed in measure in the tube (17) one group.
3. according to the described measurement mechanism of claim 2, it is characterized in that: signal cable (16) boundling of electrode (15) causes via the fixing electric insulating sealant end socket (19) of clamping nut (18) from the cylindrical shell top outlet of measuring tube (17), the upper and lower of substrate (14) respectively has one to install and fix screw, be connected and fixed with measurement tube (17) by set bolt (24) and (25), upper cover (20) has the vent port (21) that communicates with atmosphere, low head (22) is welded with adapter (23), and upper cover (20) and low head (22) all weld with measurement tube (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98206186 CN2348362Y (en) | 1998-06-29 | 1998-06-29 | Oil level precision measuring device for large oil-storage tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98206186 CN2348362Y (en) | 1998-06-29 | 1998-06-29 | Oil level precision measuring device for large oil-storage tank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2348362Y true CN2348362Y (en) | 1999-11-10 |
Family
ID=33962409
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98206186 Expired - Fee Related CN2348362Y (en) | 1998-06-29 | 1998-06-29 | Oil level precision measuring device for large oil-storage tank |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2348362Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102133982A (en) * | 2011-01-27 | 2011-07-27 | 陆春红 | Full-function metering and alarming system of oil tank |
| CN103017861A (en) * | 2011-09-28 | 2013-04-03 | 南京河海南自水电自动化有限公司 | Method for measuring liquid level of multiple points with one pressure sensor |
| CN105203188A (en) * | 2014-06-04 | 2015-12-30 | 中国石油化工股份有限公司 | Oil-water interface detector and oil tank liquid level meter calibrating device |
-
1998
- 1998-06-29 CN CN 98206186 patent/CN2348362Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102133982A (en) * | 2011-01-27 | 2011-07-27 | 陆春红 | Full-function metering and alarming system of oil tank |
| CN102133982B (en) * | 2011-01-27 | 2012-09-26 | 陆春红 | Full-function metering and alarming system of oil tank |
| CN103017861A (en) * | 2011-09-28 | 2013-04-03 | 南京河海南自水电自动化有限公司 | Method for measuring liquid level of multiple points with one pressure sensor |
| CN105203188A (en) * | 2014-06-04 | 2015-12-30 | 中国石油化工股份有限公司 | Oil-water interface detector and oil tank liquid level meter calibrating device |
| CN105203188B (en) * | 2014-06-04 | 2021-07-13 | 中国石油化工股份有限公司 | Oil-water interface detector and oil tank level gauge calibrating device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |